I went out to the shop and I would have to move some stuff to get to then at the moment. I thought someone here might know or have a pic of original 273 pistons .030 from the facory or as a dealer available option when doing a rebuild .
I realize most of the stuff you guys are saying but want some more specific info if anyone has some. I know back in the day the factory would change the specs on a crank to different main and/or rod bearings rather than disposal and this would be stamped on the block denoting which were changed. I don't know if they would change the cylinder bore and put in .030 pistons or not if there was a need to.